Re: Shoes that fit differently after a wear
I've had this happen to me. Buying ballet shoe types can be hard, because sometimes the smaller size is too small and the half size up is too loose, and sometimes it's hard to tell at all.
As someone who often feels like I need a size 8.25, here's my go-to solution: inserts. If the whole shoe feels loose, get a thin, removable, full-length insole (sometimes shoe stores will have these for free to give you). If you're having a "fat foot" day, take out the insole. If you're having a "skinny foot" day, stick it in.
Also, if you want to push your whole foot back in the shoe, try an insert that goes in under the ball of your foot. That should move your foot back a bit and give you a bit more tightness.
One of the things I discovered when I worked with shoes is that sometimes a shoe can be perfect for your feet, but need a little help to get there. Stretching in one spot to accomodate a bunion/hammer toe/etc., filing down the rough edge of a sandal strap, sticking an insert in for your heel/toe/arch. Minor adjustments, but they can make all the difference.
If the shoe doesn't fit, must we change the foot? --Gloria Steinem